Ea mantlha le e Ncha ea ic LMR14030SDDAR e kenyellelitseng chip Electronics Curcuits
Litšobotsi tsa Sehlahisoa
| MOFUTA | TLHALOSO |
| Sehlopha | Lipotoloho tse Kopantsoeng (ICs) PMIC - Voltage Regulators - DC DC Switching Regulators |
| Mfr | Lisebelisoa tsa Texas |
| Letoto | SIMPLE SWITCHER® |
| Sephutheloana | Theipi le Reel (TR) Seha Tape (CT) Digi-Reel® |
| SPQ | 75Tu be |
| Boemo ba Sehlahiswa | E sebetsa |
| Mosebetsi | Phahamisa |
| Tlhophiso ea Sephetho | E ntle |
| Topology | Buck |
| Mofuta oa Sephetho | E ka fetoha |
| Palo ea Litholoana | 1 |
| Voltage - Kenyo (Mots) | 4V |
| Voltage - Kenyo (Boholo) | 40V |
| Voltage - Output (Min/Fixed) | 0.8V |
| Voltage - Output (Boholo) | 28V |
| Hajoale - Sephetho | 3.5A |
| Khafetsa - Ho fetoha | 200kHz ~ 2.5MHz |
| Synchronous Rectifier | No |
| Mocheso oa ho sebetsa | -40°C ~ 125°C (TJ) |
| Mofuta oa ho Beha | Thaba e kaholimo |
| Sephutheloana / Taba | 8-PowerSOIC (0.154", 3.90mm Bophara) |
| Sephutheloana sa Sesebelisoa sa Bafani | 8-SO PowerPad |
| Nomoro ea Sehlahisoa sa Motheo | LMR14030 |
Phapang
Phapang lipakeng tsa DC e laolang phepelo ea matla a ho feto-fetoha le matla a marang-rang ho latela tlhaloso
Phapang ea bona e kholo ke matla a laoloang ke linear ka har'a tube (ebang ke bipolar kapa MOSFET) e sebetsa sebakeng sa linear, ha phepelo ea motlakase e kenang ka har'a tube e sebetsa sebakeng sa switching.
1. Tlhaloso ea DC e laola phepelo ea motlakase e fetohang
Motlakase oa ho fetola o amana le matla a motlakase.Ho fetola phepelo ea motlakase ke ka tube ea taolo ea potoloho bakeng sa phallo e phahameng ea lebelo le ho khaoha.Matla a DC ho matla a maqhubu a phahameng a AC ho transformer bakeng sa phetolo ea motlakase, ka hona a hlahisa sete e hlokahalang kapa sehlopha sa motlakase!Ka mantsoe a bonolo, phepelo ea motlakase e fetohang ke transformer.Ho fetola phepelo ea motlakase ho fihleloa ka: ho nchafatsoa ho DC - ho kenyelletsoa ho motlakase o hlokahalang oa AC (haholo-holo ho lokisa motlakase) - ebe o lokisoa ho tsoa ho DC voltage.
2. Tlhaloso ea matla a marang-rang
Motlakase oa linear ke transformer eo pele e fokotsang amplitude ea voltage ea alternating current ebe e e lokisa ka potoloho ea rectifier ho fumana pulsed direct current.E ntan'o tlhotloa ho fumana motlakase oa DC o nang le motlakase o monyenyane oa ripple.Ho fumana matla a phahameng a DC, e tlameha ho laoloa ke potoloho ea motlakase oa motlakase.
Taba ea bobeli, phapang lipakeng tsa molao-motheo oa ts'ebetso oa DC o laola phepelo ea motlakase le phepelo ea motlakase
Molao-motheo oa ts'ebetso ea ho fetola phepelo ea motlakase.
1. Motlakase oa AC o sefiloeng ka ho lokisoa ho DC;
2. Ka PWM e phahameng-frequency (pulse width modulation) kapa pulse frequency modulation (PFM) control switching tube, DC e tla ekeletsoa ho ea pele ea ho fetola transformer;
3. Karolo ea bobeli ea phetoho ea phetoho e etsa hore ho be le motlakase o phahameng, o lokisoang le ho hlophisoa ho mojaro;
4. Karolo e hlahisoang e khutlisetsoa ho potoloho ea taolo ka potoloho e itseng ho laola potoloho ea mosebetsi oa PWM ho finyella tlhahiso e tsitsitseng.
Molao-motheo oa ts'ebetso oa phepelo ea motlakase oa mohala.
1.Linear matla a motlakase haholo-holo a kenyelletsa transformer frequency, filter rectifier output, control circuit, protection circuit, joalo-joalo...
Motlakase oa mohala ke motlakase oa pele oa AC ka motlakase oa transformer, ebe o feta ka mochini oa rectifier circuit rectifier ho fumana motlakase oa DC o sa tsitsang.Ho fihlela boemo bo phahameng ba motlakase oa DC, motlakase o hlahisoang o tlameha ho fetoloa ke maikutlo a motlakase.Theknoloji ena ea phepelo ea motlakase e holile haholo 'me e ka fihlela botsitso bo phahameng ka ripple e nyane haholo ntle le tšitiso le lerata leo phepelo ea motlakase e nang le eona.Leha ho le joalo, bofokoli ba eona ke hore e hloka transformer e kholo le e ngata, boima le boima ba "filter capacitor" e hlokahalang le tsona li kholo haholo, 'me potoloho ea maikutlo a voltage e sebetsa ka mokhoa o tsitsitseng, kahoo ho na le ho theoha ho itseng ha motlakase ha ho fetoloa. tube, tlhahiso ea motlakase o moholoanyane o sebetsang, o hlahisang matla a ho sebelisoa ha tube ea tokiso e kholo haholo, e fokolang ea ho fetola hantle, empa hape le ho kenya mocheso o moholo oa mocheso.Phepelo ena ea motlakase ha e tšoanelehe bakeng sa likhomphutha le litlhoko tse ling tsa lisebelisoa, butle-butle e tla nkeloa sebaka ke phepelo ea motlakase.
DC e laola phepelo ea motlakase e feto-fetohang le phepelo ea motlakase ea linear ka litšobotsi tsa phapang.
Melemo e ka sehloohong le melemo ea ho fetola matla a motlakase
Melemo: Boholo bo nyane, boima bo bobebe (bolumo le boima ba 20-30% feela ea phepelo ea motlakase), ts'ebetso e phahameng (ka kakaretso ke 60-70%, athe matla a motlakase ke 30-40% feela, e leng khahlanong le tšitiso ea bona. , mefuta e mengata e fapaneng ea motlakase oa tlhahiso, modularity.
Mefokolo: Ka lebaka la matla a phahameng a maqhubu a hlahisoang potolohong ea inverter, ho na le tšitiso e itseng ho lisebelisoa tse potolohileng.Ho hlokahala tšireletso e ntle le mobu.
Likarolo tsa phepelo ea motlakase oa Linear.
Botsitso bo phahameng, ripple e nyane, ts'epahalo e phahameng, ho bonolo ho e etsa hore e be phepelo ea mefuta e mengata e tsoelang pele e feto-fetohang.Bothata ke hore li kholo, li ngata, 'me ha li sebetse hantle.Mofuta ona oa phepelo ea motlakase o laoloang 'me ho na le mefuta e mengata, ho tloha sebopehong sa tlhahiso e ka aroloa ka phepelo ea motlakase e laoloang, phepelo ea motlakase e laoloang le sete ea motlakase, botsitso ba hajoale ka motlakase o tsitsitseng, le oa hajoale (o tsitsitseng habeli) phepelo ea motlakase.Boleng ba tlhahiso bo ka aroloa ka phepelo e tsitsitseng ea phepelo ea motlakase, mofuta oa phetoho ea band, 'me potentiometer e lula e fetoha tse' maloa.Ho tsoa ho sephetho, sesupo se ka aroloa ka mofuta oa pontšo ea pointer le mofuta oa pontšo ea dijithale.
DC e laola phepelo ea motlakase e feto-fetohang le phepelo ea motlakase ea linear ka litšobotsi tsa phapang.
Melemo e ka sehloohong le melemo ea ho fetola matla a motlakase
Melemo: Boholo bo nyane, boima bo bobebe (bolumo le boima ba 20-30% feela ea phepelo ea motlakase), ts'ebetso e phahameng (ka kakaretso ke 60-70%, athe matla a motlakase ke 30-40% feela, e leng khahlanong le tšitiso ea bona. , mefuta e mengata e fapaneng ea motlakase oa tlhahiso, modularity.
Mefokolo: Ka lebaka la matla a phahameng a maqhubu a hlahisoang potolohong ea inverter, ho na le tšitiso e itseng ho lisebelisoa tse potolohileng.Ho hlokahala tšireletso e ntle le mobu.
Phapang lipakeng tsa phepelo ea motlakase e laoloang ke DC le phepelo ea motlakase ea mohala maemong a ts'ebeliso
1. Ho fetola mefuta e mengata ea lisebelisoa tsa motlakase
Ho fetola phepelo ea motlakase bakeng sa mefuta e felletseng ea motlakase, ha ho na motlakase o fapaneng, o ka sebelisa topology e fapaneng ea potoloho ho fihlela litlhoko tse fapaneng tsa tlhahiso.Sekhahla sa tokiso le ripple ea tlhahiso ha e phahame joalo ka phepelo ea motlakase, 'me katleho e phahame.E hloka likarolo tse ngata tsa peripheral le litšenyehelo tse phahameng.Potoloho e batla e rarahane.Lisebelisoa tsa motlakase tse laoloang ke DC haholo-holo li na le li-flyback tse nang le ntlha e le 'ngoe, tse eang pele, halofo ea borokho, push-pull, le mefuta ea li-circuits tsa borokho bo felletseng.Phapang ea mantlha lipakeng tsa eona le phepelo ea motlakase e laoloang ke linear ke hore transformer potolohong ha e sebetse khafetsa empa e sebetsa ho mashome a 'maloa a kilohertz ho isa ho megahertz e' maloa.Tube ea matla ha e sebetse sebakeng sa linear, empa sebakeng sa saturation le sehiloeng, ke hore, sebakeng sa ho fetoha;mofuta oa switching DC o laoloang phepelo ea matla ka hona o bitsoa.
2. Sebaka sa ts'ebeliso ea motlakase oa mohala
Lisebelisoa tsa motlakase tse laoloang ke linear hangata li sebelisoa lits'ebetsong tsa motlakase o tlase, joalo ka ha LDO li hloka ho kopana le phapang e itseng ea motlakase.Sekhahla sa taolo ea motlakase le ripple li betere, ts'ebetso e tlase, tlhoko ea likarolo tsa peripheral e tlase, 'me litšenyehelo li tlase.Potoloho e batla e le bonolo.
Mabapi le Sehlahisoa
LMR14030 ke 40 V, 3.5 A step down regulator e nang le MOSFET e holimo e kopantsoeng.Ka mefuta e mengata ea ho kenya letsoho ho tloha ho 4 V ho isa ho 40 V, e loketse lits'ebetso tse fapaneng ho tloha indastering ho ea ho likoloi bakeng sa boemo ba motlakase ho tsoa mehloling e sa laoleheng.Nako e khutsitseng ea molaoli ke 40 µA ka mokhoa oa Boroko, e loketseng lisebelisoa tse tsamaisoang ke betri.Tekanyo e tlase haholo ea 1 µA ha o ntse o koala e ka lelefatsa bophelo ba betri.Mefuta e mengata e feto-fetohang ea maqhubu a feto-fetohang e lumella bokhoni bo botle kapa boholo ba karolo ea kantle ho ntlafatsoa.Matšeliso a ka hare a loop a bolela hore mosebelisi ha a na mosebetsi o khathatsang oa moralo oa matšeliso a loop.Sena se boetse se fokotsa likarolo tsa kantle tsa sesebelisoa.Ho kenya letsoho ka nepo ho lumella ho nolofatsa taolo ea balaoli le tatellano ea matla a sistimi.Sesebelisoa se boetse se na le likarolo tsa ts'ireletso tse hahelletsoeng joalo ka moeli oa hajoale oa cycle-by-cycle, sensing ea mocheso le ho koala ka lebaka la ho felloa ke matla ho feteletseng, le ts'ireletso ea tlhahiso ea overvoltage.
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